Scapula, Clavicle, & Bony Thorax Anatomy & Bone Structure w/ Matching & Labelling (RAD 1101)

Scapula

posterior to the bony thorax (triangular shaped)

The scapula is composed of 3 angles:

- inferior

- medial (superior)

- lateral

inferior angle of the scapula

point at which the medial and lateral borders meet

medial (superior) angle of scapula

point at which superior and medial borders meet

lateral angle of scapula

located at the junction of the superior and lateral borders of the scapula

The scapula is composed of 3 borders:

- vertebral (medial)

- axial (lateral)

- superior

vertebral (medial) border of scapula

on the side closest to the vertebrae (medial edge of the scapula)

axial (lateral) border of scapula

lateral edge of the scapula

superior border of scapula

upper most border on the upper edge of the scapula

The scapula is composed of 3 processes:

- glenoid

- coracoid

- acromion

(NOTE: all better seen in the lateral view)

The processes of the scapula are all better seen in the _________ view

lateral

glenoid process of scapula

head of the process and helps to form the shoulder joint (of the scapula on the lateral anterior process)

coracoid process of scapula

beak-like anterior process and serves as the attachment for ligaments and tendons

acromion process of scapula

blunt-rounded posterior lateral process that is an extension of the scapular spine and is the highest and most posterior point of the shoulder and connects to the clavicle

scapular notch of scapula

depression at the base of the coracoid process

glenoid fossa (cavity) of scapula

depression on the glenoid process and is the articulation with the head of the humerus

neck of scapula

constriction below the glenoid process

scapular spine of scapula

ridge of bone on the posterior aspect that ends at the acromion

body of scapula

main portion (surface) of the scapula

supraspinous fossa of scapula

depression above the scapular spine on the posterior aspect

infraspinous fossa of scapula

depression below the scapular spine

subscapularis fossa of scapula

depression (dip) on the anterior aspect (above the body of the scapula)

Clavicle

part of the appendicular skeletal system

The clavicle is _____ shaped

S-shaped

The clavicle has 2 curves

- anterolateral

- anteromedial

anterolateral curve of clavicle

concave curve

anteromedial curve of clavicle

convex curve

The clavicle articulates with the __________ and ___________

acromion and manubrium

The clavicle articulates with the acromion at the _________ joint

acromioclavicular

acromioclavicular joint

holds the upper extremity to the rest of the body and forms the shoulder girdle

The clavicle articulates with the manubrium at the _________ joint

sternoclavicular

sternoclavicular joint

medial end of clavicle that connects to the sternum

Shoulder Girdle

formed by the clavicle and scapula

The shoulder girdle is _________

weight bearing

Shoulder Joint

formed by the scapula and humerus

What forms the glenoid fossa?

head of the humerus and the shoulder joint

Bony Thorax

The bony thorax is composed of the:

- sternum

- 12 thoracic vertebrae

- 12 pairs of ribs (24 ribs)

- 12 pairs of costal cartilage (sits right at front)

Sternum

breastbone located in the center of the chest

The sternum is composed of the:

- manubrium (suprasternal notch, articulations)

- sternal angle

- gladiolus (body) (articulations)

- xiphoid (ensiform)

- costal notches

manubrium

proximal or superior end portion of the sternum

suprasternal notch of manubrium

aka jugular notch or manubrial depression at the superior end of the sternum at the level of T-2 or T-3

The manubrium articulates with...

clavicles and first two pairs of ribs

sternal angle

aka "angle of lewis" which is the junction of the manubrium and the body at the level of T-4 or T-5

gladiolus (body)

center part of the bone and is the largest

The gladiolus (body) articulates with...

2nd-7th pairs of ribs which this occurs at the costal notches

xiphoid (ensiform)

pointed, distal or inferior end at the level of T-9 or T-10

costal notches

depressions that articulate with the costal cartilage of the ribs

Ribs

The ribs are composed of the:

- vertebral end (head, neck, tubercle)

- body

- sternal end

vertebral end

posterior portion

head of the vertebral end of the ribs

rounded, posterior end that articulates with the body of the vertebrae

neck of the vertebral end of the ribs

constriction below the head

tubercle of the vertebral end of the ribs

prominence that articulates with the transverse processes of the vertebrae

body of the rib

main portion

sternal end

anterior and articulates with the costal cartilage

Ribs extend downward to midaxillary line then obliquely and anteriorly

Ribs are divided into 2 groups:

- true ribs

- false ribs (floating ribs)

true ribs

first 7 pairs of ribs (1st-7th); direct costal cartilage with the sternum

false ribs

8th-12th pairs; costal cartilage fuses with the 7th rib

floating ribs

11th & 12th

costal cartilage of ribs

12 pairs

All ribs have costal cartilage on the _________ end which most attach to the sternum

anterior

Thoracic Articulations

- costalvertebral

- costotransverse

- sternocostal

- sternoclavicular

- costochondral

costalvertebral

between the head of the ribs and body of the vertebrae

costotransverse

between tubercle of the rib and transverse process of the vertebrae

sternocostal

between sternum and costal cartilage

sternoclavicular

between the sternum and clavicle

costochondral

between true ribs and costal cartilage

Surface Markings for Vertebrae

- Inferior angle of scapula - arms up - ____

arms down ____

- Suprasternal notch - _______

- Sternal angle - _________

- Xiphisternal junction -__________

inferior angle of scapula - arms up - ____

T-6

inferior angle of scapula - arms down - ____

T-8

suprasternal notch - _______

T2-T3

sternal angle - _________

T4-T5

xiphisternal junction -__________

T9-T10

Clavicle Diagram

Anterior Scapula Diagram

Posterior and Lateral Scapula Diagram

Ribs Diagram

Floating Ribs

In this AP sternum, what structure is at 1?

suprasternal or manubrial or jugular notch

In this AP sternum, what structure is at 2?

manubrium

In this AP sternum, what structure is at 3?

sternal angle

In this AP sternum, what structure is at 4?

body/gladiolus

In this AP sternum, what structure is at 5?

xiphoid

In this AP sternum, what structure is at 6?

costal notches

In this AP sternum, what structure is at 7?

space for clavicle

In this lateral sternum, what structure is at 8?

space for clavicle

In this lateral sternum, what structure is at 9?

manubrium

In this lateral sternum, what structure is at 10?

body or gladiolus

In this lateral sternum, what structure is at 11?

xiphoid

In this posterior scapula, what structure is at 1?

coracoid process

In this posterior scapula, what structure is at 2?

acromion process

In this posterior scapula, what structure is at 3?

glenoid fossa

In this posterior scapula, what structure is at 4?

inferior angle

In this posterior scapula, what structure is at 5?

body

In this posterior scapula, what structure is at 6?

scapular spine

In this posterior scapula, what structure is at 7?

superior or medial angle

In this posterior scapula, what structure is at 8?

scapular notch

In this lateral scapula, what structure is at 1?

superior or medial angle